change this line to static const char* modes[]={ "Off", "1/3 EV","2/3 EV", "1 EV", "1 1/3Ev", "1 2/3Ev", "2 Ev", "2 1/3Ev", "2 2/3Ev", "3 Ev"};(you can go on as much as you want BUT the values must be spaced by 1/3 EV)